1 | initial version |

The underscore `_`

stores the previous result (double underscore `__`

stores the pre-previous and triple underscore `___`

stores the pre-pre-previous):

```
sage: 10 * 10
100
sage: _ + 1
101
sage: __ + 3
103
sage: ___ + 5
105
```

2 | No.2 Revision |

The underscore `_`

stores the previous ~~result (double ~~result. The double underscore `__`

stores the pre-previous and triple underscore `___`

stores the ~~pre-pre-previous):~~pre-pre-previous:

```
sage: 10 * 10
100
sage: _ + 1
101
sage: __ + 3
103
sage: ___ + 5
105
```

You may also use the list `Out`

which stores all of the results:

```
sage: Out
{1: 100, 2: 101, 3: 103, 4: 105}
```

3 | No.3 Revision |

~~The ~~SageMath command line and Jupyter notebook are both based on ipython. As described in the section Output caching system documention ipython, the underscore `_`

stores the previous result. The double underscore `__`

stores the pre-previous and triple underscore `___`

stores the pre-pre-previous:

```
sage: 10 * 10
100
sage: _ + 1
101
sage: __ + 3
103
sage: ___ + 5
105
```

You may also use the list `Out`

which stores all of the results:

```
sage: Out
{1: 100, 2: 101, 3: 103, 4: 105}
```

or `_<n>`

where `n`

the n-th output from the start:

```
sage: _3
103
```

4 | No.4 Revision |

SageMath command line and Jupyter notebook are both based on ipython. As described in the section Output caching system of the documention of ipython, the underscore `_`

stores the previous result. The double underscore `__`

stores the pre-previous and triple underscore `___`

stores the pre-pre-previous:

```
sage: 10 * 10
100
sage: _ + 1
101
sage: __ + 3
103
sage: ___ + 5
105
```

You may also use the list `Out`

which stores all of the results:

```
sage: Out
{1: 100, 2: 101, 3: 103, 4: 105}
```

or `_<n>`

where `n`

the n-th output from the start:

```
sage: _3
103
```

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